人教版（2019）选择性必修第三册 Unit 2 Healthy Lifestyle Grammar—Infinitives (3) as the subject课件（20张PPT）
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| 名称 | 人教版（2019）选择性必修第三册 Unit 2 Healthy Lifestyle Grammar—Infinitives (3) as the subject课件（20张PPT） |  | |
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| 资源类型 | 教案 | ||
| 版本资源 | 人教版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2023-08-21 17:19:25 | ||
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(共20张PPT)
Unit 2 healthy lifestyle
Grammar—Infinitives (3)
as the subject
课堂目标
不定式作主语的魅力
It is wise of you to devote money and time to keeping you healthy and fit. To go jogging is among the best forms of exercise.
语法导入
1. Look at the following sentences and pay attention to the italicized infinitives. Find more infinitives in the reading passage, and tell their meanings and functions.
（1）To change bad habits is never easy.
（2）It took the surgeon three hours to finish my mother’s ling surgery.
（3）To join the people’s Liberation Army, it is required for men to shave
off their beards.
（4）It was not polite to disturb your neighbors with loud music last night.
More infinitives in the reading passage
（1）….it can be easy for some of them to form bad habits.
（2） After all, it is not easy to break bad habits.
动词不定式在句中作主语，为了保持句子的平衡，避免头重脚轻，常用it作形式主语，而真正的主语不定式放在句子的末尾。比如上页中的第2；3；4例句。
（1）important/avoid/passive cigarette smoking
It is important to avoid passive cigarette smoking.
（2）will take/nutrition specialist/a balanced diet menu/make/an
hour/for you
It will take an hour for a nutrition specialist to make a
balanced diet menu for you.
2. Join the words to make full sentences using infinitives.
（3）useful/turn to/fitness consultant/for advice
It is useful to turn to a fitness consultant for advice.
（4）illegal /dangerous/take /drugs
It is dangerous to take illegal drugs.
（5）harmful/skip breakfast/often
It is harmful to skip breakfast often.
2. Join the words to make full sentences using the infinitive.
3. Complete the conversations with the correct forms of the phrases in the box.
（1）A: Hello, doctor. I want to lose weight, but I just can 't seem to do it. What can you do to help me
B : Well, first, it's necessary to ______________ what you eat. Cut out all fatty food and sugary drinks, and eat more fruit and vegetables.
begin with be in control of make a choice decide on make up one’s mind
be in control of
（3）A: Before exercising, always do a few warm-ups to __________.
B:I know. But then I always feel too tired to continue!
（4）A: Should I go for the pizza or the fried chicken I hate _____________ like these. You know what —I'm going to eat both!
B: Wow！Don't eat too much junk food—you'll get fat. I've actually _______________ to go on a diet, so I'll just stick to the fruit salad.
begin with
making choices
made up my mind
（2）A: I really need to _________ a way to exercise more. I could use a fitness app, but my phone's full.
B: So delete a few files. I'm sure the app doesn't take up much space.
decide on
不定式作主语的用法
不定式to do, 相当于名词,可以作主语。
To listen to music makes us relaxed and happy.
To do what we are interested in is great fun.
单个不定式作主语，谓语动词用单数。
语法讲解
不定式to do作主语的位置
不定式to do作主语的位置：
1. 不定式放句首；
2. it作形式主语放句首，而把真正的主语不定式，放句子后面。
To look after the children is her job.
It is her job to look after the children.
不定式作主语和动词-ing形式作主语的区别？
动词-ing形式和不定式作主语, 都是说明一个内容。
不定式通常表示一个将来的或临时、具体的内容;
而动词-ing形式则表示一种经常性的、习惯的或抽象的概念。
To do some cleaning is her job today.
她今天的工作是打扫卫生。
Doing some cleaning is her job.
打扫卫生是她的工作。
不定式作主语，it 作形式主语的常见结构有哪些？
It is +adj.+ (for sb.) to do
It is easy for me to learn how to cook.
学做饭对我来说很轻松。
It is +adj.+(of sb.) to do
It is wise of you to take regular exercise.
你定期锻炼是明智的。
不定式作主语，it 作形式主语的常见结构有哪些？
It is +n.+ to do sth. ( an honor, our duty, a pity, a shame)
It is our duty to do our work well.
干好我们的工作是我们的责任。
It takes/took sb. some time to do sth.
It takes me half an hour to go jogging every day.
我每天花半个小时慢跑。
“疑问词 + 不定式” 作主语
可用于该结构的疑问词
疑问代词：who，whom，what，which
疑问副词：when，where，how
常接该结构的动词：know，see，decide，tell，ask，consider，explain，learn，wonder
How to solve all the problems is very significant.
When to get started is not known.
Where to find such a nice place is no easy for me.
由 for/of 引出不定式逻辑主语的两个句式
如果要说明不定式表示的动作是谁做的，可以在不定式前加一个由 for/of 引起的短语,构成不定式的复合结构
It is + adj. +for sb. to do …（修饰物的形容词）
(adj.: easy, difficult, comfortable, pleasant, light, dangerous， tiresome, interesting, heavy, fit)
It is + adj. + of sb. to do…（修饰人品形容词）
(adj.: kind, good, nice, wise, unwise, clever, silly, stupid, foolish, careless, rude, polite, naughty)
1. It’s better （say）no to junk food.
2. While is a big challenge to protect our environment，we can’t help but go ahead.
3. （reduce）air pollution is necessary.
4. It was foolish her to endanger her life in that way.
5. Don’t you think it is rude him to ask your income
to say
it
To reduce/Reducing
of
of
单句语法填空
活学活用
1. How to construct the theoretical framework is very important.
2. When to start developing such a vaccine is the question.
3. Where to find that patriotic young man is a headache for me.
翻译句子
到哪里去找那个爱国的年轻人令我头疼。
怎样构建理论框架很重要。
问题是何时开始研制这种疫苗。
4. 学开车对我来说很轻松。
It is easy for me to learn how to drive.
5. 你申请这个职位真是明智的。
It is clever of you to apply for the position.
6. 照顾你是我们的责任。
It is our duty to take care of you.
7. 我花了半个小时做家务。
It took me half an hour to do housework.
翻译句子
Go over what we have learnt.
Finish the Exercises in this unit on workbook.
Homework
Goodbye!
Unit 2 healthy lifestyle
Grammar—Infinitives (3)
as the subject
课堂目标
不定式作主语的魅力
It is wise of you to devote money and time to keeping you healthy and fit. To go jogging is among the best forms of exercise.
语法导入
1. Look at the following sentences and pay attention to the italicized infinitives. Find more infinitives in the reading passage, and tell their meanings and functions.
（1）To change bad habits is never easy.
（2）It took the surgeon three hours to finish my mother’s ling surgery.
（3）To join the people’s Liberation Army, it is required for men to shave
off their beards.
（4）It was not polite to disturb your neighbors with loud music last night.
More infinitives in the reading passage
（1）….it can be easy for some of them to form bad habits.
（2） After all, it is not easy to break bad habits.
动词不定式在句中作主语，为了保持句子的平衡，避免头重脚轻，常用it作形式主语，而真正的主语不定式放在句子的末尾。比如上页中的第2；3；4例句。
（1）important/avoid/passive cigarette smoking
It is important to avoid passive cigarette smoking.
（2）will take/nutrition specialist/a balanced diet menu/make/an
hour/for you
It will take an hour for a nutrition specialist to make a
balanced diet menu for you.
2. Join the words to make full sentences using infinitives.
（3）useful/turn to/fitness consultant/for advice
It is useful to turn to a fitness consultant for advice.
（4）illegal /dangerous/take /drugs
It is dangerous to take illegal drugs.
（5）harmful/skip breakfast/often
It is harmful to skip breakfast often.
2. Join the words to make full sentences using the infinitive.
3. Complete the conversations with the correct forms of the phrases in the box.
（1）A: Hello, doctor. I want to lose weight, but I just can 't seem to do it. What can you do to help me
B : Well, first, it's necessary to ______________ what you eat. Cut out all fatty food and sugary drinks, and eat more fruit and vegetables.
begin with be in control of make a choice decide on make up one’s mind
be in control of
（3）A: Before exercising, always do a few warm-ups to __________.
B:I know. But then I always feel too tired to continue!
（4）A: Should I go for the pizza or the fried chicken I hate _____________ like these. You know what —I'm going to eat both!
B: Wow！Don't eat too much junk food—you'll get fat. I've actually _______________ to go on a diet, so I'll just stick to the fruit salad.
begin with
making choices
made up my mind
（2）A: I really need to _________ a way to exercise more. I could use a fitness app, but my phone's full.
B: So delete a few files. I'm sure the app doesn't take up much space.
decide on
不定式作主语的用法
不定式to do, 相当于名词,可以作主语。
To listen to music makes us relaxed and happy.
To do what we are interested in is great fun.
单个不定式作主语，谓语动词用单数。
语法讲解
不定式to do作主语的位置
不定式to do作主语的位置：
1. 不定式放句首；
2. it作形式主语放句首，而把真正的主语不定式，放句子后面。
To look after the children is her job.
It is her job to look after the children.
不定式作主语和动词-ing形式作主语的区别？
动词-ing形式和不定式作主语, 都是说明一个内容。
不定式通常表示一个将来的或临时、具体的内容;
而动词-ing形式则表示一种经常性的、习惯的或抽象的概念。
To do some cleaning is her job today.
她今天的工作是打扫卫生。
Doing some cleaning is her job.
打扫卫生是她的工作。
不定式作主语，it 作形式主语的常见结构有哪些？
It is +adj.+ (for sb.) to do
It is easy for me to learn how to cook.
学做饭对我来说很轻松。
It is +adj.+(of sb.) to do
It is wise of you to take regular exercise.
你定期锻炼是明智的。
不定式作主语，it 作形式主语的常见结构有哪些？
It is +n.+ to do sth. ( an honor, our duty, a pity, a shame)
It is our duty to do our work well.
干好我们的工作是我们的责任。
It takes/took sb. some time to do sth.
It takes me half an hour to go jogging every day.
我每天花半个小时慢跑。
“疑问词 + 不定式” 作主语
可用于该结构的疑问词
疑问代词：who，whom，what，which
疑问副词：when，where，how
常接该结构的动词：know，see，decide，tell，ask，consider，explain，learn，wonder
How to solve all the problems is very significant.
When to get started is not known.
Where to find such a nice place is no easy for me.
由 for/of 引出不定式逻辑主语的两个句式
如果要说明不定式表示的动作是谁做的，可以在不定式前加一个由 for/of 引起的短语,构成不定式的复合结构
It is + adj. +for sb. to do …（修饰物的形容词）
(adj.: easy, difficult, comfortable, pleasant, light, dangerous， tiresome, interesting, heavy, fit)
It is + adj. + of sb. to do…（修饰人品形容词）
(adj.: kind, good, nice, wise, unwise, clever, silly, stupid, foolish, careless, rude, polite, naughty)
1. It’s better （say）no to junk food.
2. While is a big challenge to protect our environment，we can’t help but go ahead.
3. （reduce）air pollution is necessary.
4. It was foolish her to endanger her life in that way.
5. Don’t you think it is rude him to ask your income
to say
it
To reduce/Reducing
of
of
单句语法填空
活学活用
1. How to construct the theoretical framework is very important.
2. When to start developing such a vaccine is the question.
3. Where to find that patriotic young man is a headache for me.
翻译句子
到哪里去找那个爱国的年轻人令我头疼。
怎样构建理论框架很重要。
问题是何时开始研制这种疫苗。
4. 学开车对我来说很轻松。
It is easy for me to learn how to drive.
5. 你申请这个职位真是明智的。
It is clever of you to apply for the position.
6. 照顾你是我们的责任。
It is our duty to take care of you.
7. 我花了半个小时做家务。
It took me half an hour to do housework.
翻译句子
Go over what we have learnt.
Finish the Exercises in this unit on workbook.
Homework
Goodbye!